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In recent years, transition metal dichalcogenide was one of the key two-dimensional materials for quantum functional applications. These materials have a honeycomb like graphene but have spin-orbit coupling that allows them to exhibit novel properties. As an example, molybdenum isosulfide's energy band structure evolved from an indirect band gap to a directly band gap. This greatly improved the fluorescence efficiencies and the light absorbance cross section. It is important to understand the mechanisms behind these quantum phenomena in order to manipulate them. This will be of great benefit to condensed matter science and future electronics and optoelectronics.
Professor Wu Shiwei says that this idea is based on "ultra-thinness" of two-dimensional quantum-functional materials. The monoatomic layer is folded straight like a paper and a second material forms that can't be produced by epitaxial or natural crystallization. Layer structure. Molybdenum Disulfide “origami” has many interlayer arrangements depending on the direction and location of the fold line. This in turn results in different macrostructure symmetry, and interlayer coupling. The team combined first-principles computations with various experimental techniques including fluorescence spectroscopy and optical depolarization to study the spatial electronic structure of different types molybdenum "origami".
In addition, the change of interlayer coupling not only can greatly affect indirect band gaps in molybdenum-disulfide "origami", but it can also be used to switch the relationship between spine and electron spin when "folding the paper". Changes in interlayers can affect not only the indirect band gap, but also the relationship between spine and electron spin. This work provides an experimental platform that allows for the manipulation of interactions between multiple degrees of free will, including valley, spin and interlayer coupling.
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